Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"thu hoan de snippets" » "thi hoan de snippets", "thu hoach de snippets", "thu ha de snippets", "thu hoang de snippets", "thu toan de snippets", "thu hoang le snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("thu hoan de snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("thu hoan de snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( thu hoan de snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("thu hoan de snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.